<div>
    <a class="js_commitbutton_ppt com_btn_round pptshell_button com_btn_disabled" href="javascript:;"
       style="display: none">
        <span class="icons_box hide_dom"></span>
        <span class="text_box">提&nbsp;&nbsp;交</span>
    </a>
    <span class="uedc_preload_img_01" style="display:none"></span>
    <span class="uedc_preload_img_02" style="display:none"></span>
    <div class="pad_button" style="display: none">
        <div class="buttons show">
            <div class="submit-wrapper">
                <div class="tip"></div>
                <div id="answer-question-submit" class="com_btn_disabled">提交</div>
            </div>
        </div>
        <div class="mask-dialog" style="display: none;">
            <div class="mask"></div>
            <div class="dialog">
                <p class="message">请听老师讲解！</p>
            </div>
        </div>
        <div class="mask-dialog-submitting" style="display: none">
            <div class="mask-submitting"></div>
            <div class="dialog-submitting">
                <p class="message-submitting">正在提交...</p>
            </div>
        </div>
        <div class="can-not-do-it"></div>
    </div>
</div>